How can i import the world nodes to another .blend file?
You can append the world settings from this file to yours.

To append type Shift + F1 or go to File --> Append.
Navigate to where you saved this file, then click it, and then the world "subfolder". Select the item called "World" within.

Then go to your world settings in the Properties Windows --> World Tab, and choose the new world (Probably "World.001") from the dropdown menu.